US20170210182A1 - Pneumatic tire - Google Patents
Pneumatic tire Download PDFInfo
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- US20170210182A1 US20170210182A1 US15/409,668 US201715409668A US2017210182A1 US 20170210182 A1 US20170210182 A1 US 20170210182A1 US 201715409668 A US201715409668 A US 201715409668A US 2017210182 A1 US2017210182 A1 US 2017210182A1
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- Prior art keywords
- protruding portion
- pneumatic tire
- tire according
- tire
- protruding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C13/00—Tyre sidewalls; Protecting, decorating, marking, or the like, thereof
- B60C13/02—Arrangement of grooves or ribs
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C11/00—Tyre tread bands; Tread patterns; Anti-skid inserts
- B60C11/01—Shape of the shoulders between tread and sidewall, e.g. rounded, stepped or cantilevered
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C13/00—Tyre sidewalls; Protecting, decorating, marking, or the like, thereof
- B60C13/002—Protection against exterior elements
Definitions
- the present invention relates to a pneumatic tire provided on the outer surface of a sidewall portion with a protector protruding axially outwardly.
- Patent Literature 1 discloses a pneumatic tire with improved mud performance and cut resistance by improving the shape and position of a protector of the sidewall portion.
- the pneumatic tire disclosed in the Patent Literature 1 can be improved in the cut resistant performance by increasing the protruding height of the protector of the sidewall portion.
- the protruding height is large, the sidewall portion becomes easy to accumulate heat, and as a result, there is a possibility that the durability of the pneumatic tire is deteriorated.
- the present invention was made in view of the above, and a primary object thereof is to provide a pneumatic tire of which durability is improved by providing a protector composed of patterned unit protrusions having an improved configuration.
- a pneumatic tire comprises
- the third protruding portion is connected with the first protruding portion at a position radially away from the radially inner and outer ends of the first protruding portion.
- the third protruding portion is connected with the second protruding portion at a position radially away from the radially outer and inner ends of the second protruding portion.
- the third protruding portion is connected with each of the first protruding portion and the second protruding portion at a position closer to the radially inner end than the radially outer end thereof.
- the third protruding portion is inclined with respect to the tire circumferential direction.
- the circumferential dimension of the first protruding portion is the same as the circumferential dimension of the second protruding portion.
- the radial height (radial position) of the radially outer end of the first protruding portion is substantially the same as the radial height (radial position) of the radially outer end of the second protruding portion.
- the protector is formed within a radial range between 0.5 times and 0.9 times the cross sectional height of the tire from a bead base line.
- the protector is provided with not-protruding parts which are formed between the patterned unit protrusions arranged circumferentially at intervals.
- the sidewall portion becomes less likely to accumulate heat, while maintaining the cut resistance.
- the concavity/convexity structure of the patterned unit protrusions and the not-protruding parts can disturb the air flow along the sidewall portion during running, and generate turbulence around the protector. Therefore, it is possible to increase the heat dissipation. As a result, the temperature rise of the sidewall portion is suppressed and the durability of the pneumatic tire is improved.
- the patterned unit protrusion can be increased in the circumferential rigidity by the third protruding portion connecting between the first protruding portion and the second protruding portion.
- the normally inflated unloaded condition is such that the tire is mounted on a standard wheel rim and inflate to a standard pressure but loaded with no tire load.
- the undermentioned normally inflated loaded condition is such that the tire is mounted on the standard wheel rim and inflated to the standard pressure and loaded with the standard tire load.
- the standard wheel rim R is a wheel rim officially approved or recommended for the tire by standards organizations, i.e. JATMA (Japan and Asia), T&RA (North America), ETRTO (Europe), TRAA (Australia), STRO (Scandinavia), ALAPA (Latin America), ITTAC (India) and the like which are effective in the area where the tire is manufactured, sold or used.
- the standard pressure and the standard tire load are the maximum air pressure and the maximum tire load for the tire specified by the same organization in the Air-pressure/Maximum-load Table or similar list.
- the standard wheel rim is the “standard rim” specified in JATMA, the “Measuring Rim” in ETRTO, the “Design Rim” in TRA or the like.
- the standard pressure is the “maximum air pressure” in JATMA, the “Inflation Pressure” in ETRTO, the maximum pressure given in the “Tire Load Limits at various Cold Inflation Pressures” table in TRA or the like.
- the standard load is the “maximum load capacity” in JATMA, the “Load Capacity” in ETRTO, the maximum value given in the above-mentioned table in TRA or the like.
- the tread edges are the axial outermost edges of the ground contacting patch which occurs under the normally inflated loaded condition when the camber angle of the tire is zero.
- FIG. 1 is a cross sectional view of the pneumatic tire as an embodiment of the present invention.
- FIG. 2 is a perspective partial view of the tire showing the protector.
- FIG. 3 shows a patterned unit protrusion
- FIG. 1 shows a cross-section of a pneumatic tire 1 as an embodiment of present invention under the normally inflated unloaded condition.
- the pneumatic tire 1 comprises a tread portion 2 , a pair of axially spaced bead portions 4 each with a bead core 5 therein, a pair of sidewall portions 3 extending between the tread edges and the bead portions 4 , a carcass 6 extending between the bead portions 4 through the tread portion 2 and the sidewall portions 3 , and a tread reinforcing belt 7 disposed radially outside the carcass 6 in the tread portion 2 .
- the tread portion 2 is suitably provided with grooves 8 for draining water or mud.
- the carcass 6 is composed of at least one (in this embodiment, only one) ply 6 A of cords extending between the bead portions 4 through the tread portion 2 and the sidewall portions 3 , and turned up around the bead core 5 in each of the bead portions 4 from the axially inside to the outside f the tire so as to form a pair of turned up portions 6 b and a main portion 6 a therebetween.
- the carcass cords of the ply 6 A are arranged at an angle in a range from 75 to 90 degrees with respect to the tire equator c, for example.
- organic fiber cords made of nylon, polyester, rayon, or the like can be suitably used.
- the belt 7 comprises at least two plies (in this embodiment, only two cross plies 7 A and 7 B) each made of parallel cords laid at an angle in a range from 15 to 35 degrees with respect to the tire equator C, for example.
- the belt cords of the belt ply 7 A intersect with those of the belt ply 7 B.
- high modulus cords in particular steel cords are preferably used.
- At least one of the sidewall portions 3 is provided with a protector 9 protruding axially outwardly from the outer surface 3 a thereof.
- the protector 9 is made of rubber integrally with the sidewall portion.
- each of the sidewall portions 3 is provided with the protector 9 .
- the protector 9 is preferably formed within a range between 0.5 times and 0.9 times the cross sectional height H of the tire from the bead base line BL. such protector 9 can improve the cut resistant performance of the sidewall portion 3 .
- the cross sectional height H of the tire is a radial distance from the bead base line BL to the ground contacting surface of the tread portion at the tire equator C.
- the radial height H1 of the radially outer end 9 a of the protector 9 from the bead base line BL is set in a range between 0.75 times and 0.85 times the cross sectional height H of the tire. If the radial height H1 is more than 0.85 times the cross sectional height H, the radially outer end 9 a of the protector 9 becomes likely to come into contact with the ground when running on even roads such as well paved roads. Therefore, there is a possibility that the ride comfort is deteriorated and the wear of the protector 9 occurs at an early stage. on the other hand, if the height H1 is less than 0.75 times the cross sectional height H, the region of the tire where cut damage is likely to occur cannot be protected, and it becomes difficult to improve the cut resistant performance.
- the radial height H2 of the radially inner end 9 b of the protector 9 from the bead base line BL is set in a range between 0.5 times and 0.6 times the cross sectional height H of the tire. If the radial height H2 is more than 0.6 times the cross sectional height H, the range protected by the protector 9 becomes small, and the cut resistant performance can not be improved effectively. on the other hand, if the height H2 is less than 0.5 times the cross sectional height H, the protector 9 becomes excessively large, therefore, it is possible that the tire weight increases and the heat becomes likely to accumulate.
- the protruding height t of the protector 9 is preferably not less than 2 mm, more preferably not less than 4 mm. If the protruding height t is less than 2 mm, the effect of the protector 9 to protect the sidewall portion 3 is decreased, and the cut resistant performance is not improved.
- the protruding height t of the protector 9 is preferably not more than 15 mm, more preferably not more than 12 mm. If the protruding height t is more than 15 mm, the tire weight increases and heat is likely to accumulate in the protector 9 .
- FIG. 2 is a perspective view of the protector 9 .
- the protector 9 in this embodiment is composed of a number of patterned unit protrusions 9 A arranged at intervals in the tire circumferential direction.
- the patterned unit protrusions 9 A on each of the sidewall portions 3 have the same shape and arranged in the same direction with respect respective radial directions of the tire.
- the patterned unit protrusions 9 A are disposed at substantially the same radial height.
- the protector 9 is provided with not-protruding parts between the patterned unit protrusions. Therefore, the sidewall portion 3 becomes less likely to accumulate heat, while maintaining the cut resistant performance.
- the concavity/convexity structure of the patterned unit protrusions 9 A and the not-protruding parts can disturb the air flow along the outer surface of the sidewall portion. As a result, it is possible to increase the heat dissipation. Accordingly, the temperature rise of the sidewall portion 3 is suppressed and the durability of the tire 1 is improved.
- the patterned unit protrusion 9 A is composed of a first protruding portion 10 , a second protruding portion 11 and a third protruding portion 12 as shown in FIG. 3 .
- the first protruding portion 10 and the second protruding portion 11 extend in the tire radial direction, and are arranged so as to be spaced away from each other in the tire circumferential direction.
- the first protruding portion 10 is configured as substantially rectangular having a radial dimension L1 and a circumferential dimension w1.
- the radial dimension L1 is preferably greater than the circumferential dimension w1.
- the circumferential dimension w1 is set in a range from 0.15 times to 0.3 times the circumferential dimension w of the patterned unit protrusion 9 A. If the circumferential dimension w1 is less than 0.15 times the circumferential dimension w, there is possibly that the effect of the protector 9 to protect the sidewall portion 3 is decreased, and the cut resistant performance is not improved. on the other hand, if the circumferential dimension w1 is greater than 0.3 times the circumferential dimension w, there is a possibility that the tire weight is increased, and heat is accumulated in the patterned unit protrusion 9 A.
- the above-mentioned second protruding portion 11 is configured as substantially rectangular having a radial dimension L2 and a circumferential dimension w2.
- the radial dimension L2 is preferably more than the circumferential dimension w2.
- the circumferential dimension w2 is preferably set in a range from 0.15 times to 0.3 times the circumferential dimension w. If the circumferential dimension w2 is less than 0.15 times the circumferential dimension w, there is a possibility that the effect of the protector 9 to protect the sidewall portion 3 decreases, and the cut resistant performance is not improved. on the other hand, if the circumferential dimension w2 is greater than 0.3 times the circumferential dimension w, there is a possibility that the tire weight increases, and heat is accumulated.
- the radial dimension L1 of the first protruding portion 10 is more than the radial dimension L2 of the second protruding portion 11 .
- the patterned unit protrusion 9 A having such first and second protruding portions 10 and 11 can generate a swirling air flow therearound during running due to the difference between the radial dimensions L1 and L2. As a result, the sidewall portion 3 can dissipate heat more efficiently, and the durability of the tire 1 can be further improved.
- the first protruding portion 10 has a pair of radial ends 10 e, namely, a radially outer end 10 a and a radially inner end 10 b, between which the radial dimension L1 is defined.
- the second protruding portion 11 has a pair of radial ends 11 e, namely, a radially outer end 11 a and a radially inner end 11 b, between which the radial dimension L2 is defined.
- the radial height of the radially outer end 10 a of the first protruding portion 10 is substantially the same as the radial height of the radially outer end 11 a of the second protruding portion 11 .
- the radially inner end 11 b of the second protruding portion 11 is positioned radially outside the radially inner end 10 b of the first protruding portion 10 .
- the circumferential dimension w1 of the first protruding portion 10 is substantially the same as the circumferential dimension w2 of the second protruding portion 11 .
- the patterned unit protrusion 9 A having such first and the second protruding portions 10 and 11 can suppress deterioration of ride comfort, disproportion of the rigidity in the tire circumferential direction, and uneven wear of the tire 1 .
- a distance L3 between the first protruding portion 10 and the second protruding portion 11 in the tire circumferential direction is more than the circumferential dimension w1 of the first protruding portion 10 and more than the circumferential dimension w2 of the second protruding portion 11 .
- the above-mentioned third protruding portion 12 connects between the first protruding portion 10 and the second protruding portion 11 in the tire circumferential direction.
- the patterned unit protrusion 9 A can be increased in the rigidity in the tire circumferential direction.
- the third protruding portions 12 suppress the movement of the tread edge, and improve the uneven wear resistance performance, therefore, it is possible to improve the durability of the tire 1 .
- the third protruding portion 12 is connected with the first protruding portion 10 at a position radially away from both of the radial ends 10 e (the radially outer end 10 a and the radially inner end 10 b ).
- the first protruding portion 10 is likely to generate turbulence in the vicinity of the radial ends 10 e during running, therefore, it is possible to increase the heat dissipation from the sidewall portion 3 .
- the third protruding portion 12 is connected with the second protruding portion 11 at a position radially away from both of the radial ends 11 e (the radially outer end 11 a and the radially inner end 11 b ).
- the second protruding portion 11 is likely to generate turbulence in the vicinity of the radial ends 11 e during running, therefore, it is possible to increase the heat dissipation from the sidewall portion 3 .
- the third protruding portion 12 is connected to a part of the first protruding portion 10 closer to the radially inner end 10 b, and connected to a part of the second protruding portion 11 closer to the radially inner end 11 b.
- the radial center of the connection part of the third protruding portion 12 with the first protruding portion 10 is positioned closer to the radially inner end 10 b than the radially outer end 10 a
- the radial center of the connection part of the third protruding portion 12 with the second protruding portion 11 is positioned closer to the radially inner end 11 b than the radially outer end 11 a. Therefore, when the radially outer parts of the first and second protruding portions 10 and 11 contact with the mud and the like during running on muddy roads, for example, the radially outer parts can transmit more drive power, and the traction performance can be improved.
- the third protruding portion 12 is preferably inclined with respect to the tire circumferential direction in order to increase the rigidity both in the tire circumferential direction and the tire radial direction.
- the width w3 of the third protruding portion 12 measured orthogonally to the longitudinal direction thereof is substantially the same as the circumferential dimension w1 of the first protruding portion 10 and the circumferential dimension w2 of the second protruding portion 11 .
- the patterned unit protrusion 9 A consisting of the protruding portions 10 , 11 and 12 can suppress local unevenness of the rigidity, deterioration of ride comfort, and uneven wear of the tire 1 .
- the total area of the first, second and third protruding portions 10 , 11 and 12 is set in a range from 40% to 60% of the area of a rectangle whose height and width correspond to the radial dimension L1 of the first protruding portion 10 and the circumferential dimension w of the patterned unit protrusion 9 A.
- Test tires (pneumatic tires of size 265/70R17 for passenger cars) having the structure shown in FIG. 1 and specifications listed in Table 1 were experimentally manufactured and tested for the cut resistant performance, heat dissipation performance and uneven wear resistance performance. The test methods are as follows.
- test tires were mounted on all of the wheels of a 4WD car, and after running for 1500 km on a rubble-strewn rough road, the sidewall portions were checked for cut damages. Then, for each of the cut damages, its length and width were multiplied to obtain the product, and the products were totalized.
- the results are indicated in Table 1 by an index based on the reciprocal number of Comparative example 1 being 100, wherein the larger the index value, the higher the cut resistant performance.
- test tires as the working examples were improved in the heat dissipation performance and the uneven wear resistant performance, while maintaining about the same cut resistant performance as the comparative examples.
Abstract
Description
- The present invention relates to a pneumatic tire provided on the outer surface of a sidewall portion with a protector protruding axially outwardly.
- There has been known a pneumatic tire whose sidewall portion is provided on the outer surface thereof with an axially outwardly protruding protector. owing to the protector, the sidewall portion of such pneumatic tire can be prevented from cut damage caused by a sharp-edged stone and the like hitting the sidewall portion when running on rough dirt roads, for example.
- Japanese Patent Application Publication No. 2012-006449 (Patent Literature 1) discloses a pneumatic tire with improved mud performance and cut resistance by improving the shape and position of a protector of the sidewall portion.
- The pneumatic tire disclosed in the
Patent Literature 1 can be improved in the cut resistant performance by increasing the protruding height of the protector of the sidewall portion. However, if the protruding height is large, the sidewall portion becomes easy to accumulate heat, and as a result, there is a possibility that the durability of the pneumatic tire is deteriorated. - The present invention was made in view of the above, and a primary object thereof is to provide a pneumatic tire of which durability is improved by providing a protector composed of patterned unit protrusions having an improved configuration.
- According to the present invention, a pneumatic tire comprises
-
- sidewall portions at least one of which outer surface is provided with an axially outwardly protruding protector, the protector composed of patterned unit protrusions arranged at intervals in the tire circumferential direction, wherein
- each of the patterned unit protrusions comprises a first protruding portion, a second protruding portion and a third protruding portion,
- the first protruding portion and the second protruding portion extend in a tire radial direction and are spaced apart from each other in the tire circumferential direction,
- the third protruding portion connects between the first protruding portion and the second protruding portion, and
- the radial dimension of the first protruding portion is more than the radial dimension of the second protruding portion.
- In the pneumatic tire according to the present invention, it is preferable that the third protruding portion is connected with the first protruding portion at a position radially away from the radially inner and outer ends of the first protruding portion.
- In the pneumatic tire according to the present invention, it is preferable that the third protruding portion is connected with the second protruding portion at a position radially away from the radially outer and inner ends of the second protruding portion.
- In the pneumatic tire according to the present invention, it is preferable that the third protruding portion is connected with each of the first protruding portion and the second protruding portion at a position closer to the radially inner end than the radially outer end thereof.
- In the pneumatic tire according to the present invention, it is preferable that the third protruding portion is inclined with respect to the tire circumferential direction.
- In the pneumatic tire according to the present invention, it is preferable that the circumferential dimension of the first protruding portion is the same as the circumferential dimension of the second protruding portion.
- In the pneumatic tire according to the present invention, it is preferable that the radial height (radial position) of the radially outer end of the first protruding portion is substantially the same as the radial height (radial position) of the radially outer end of the second protruding portion.
- In the pneumatic tire according to the present invention, it is preferable that the protector is formed within a radial range between 0.5 times and 0.9 times the cross sectional height of the tire from a bead base line.
- According to the present invention, therefore, the protector is provided with not-protruding parts which are formed between the patterned unit protrusions arranged circumferentially at intervals. As a result, the sidewall portion becomes less likely to accumulate heat, while maintaining the cut resistance. Further, the concavity/convexity structure of the patterned unit protrusions and the not-protruding parts can disturb the air flow along the sidewall portion during running, and generate turbulence around the protector. Therefore, it is possible to increase the heat dissipation. As a result, the temperature rise of the sidewall portion is suppressed and the durability of the pneumatic tire is improved.
- Further, the patterned unit protrusion can be increased in the circumferential rigidity by the third protruding portion connecting between the first protruding portion and the second protruding portion. Thereby, the movement of a tire shoulder portion including a tread edge portion can be suppressed and the uneven-wear resistance can be improved to improve the durability of the pneumatic tire.
- Furthermore, owing to the difference between the radial dimensions of the first and second protruding portions, a swirling air flow can be generated during running, therefore, the sidewall portion dissipates heat more efficiently, and the durability of the pneumatic tire can be further improved.
- In this application including specification and claims, various dimensions, positions and the like of the tire refer to those under a normally inflated unloaded condition of the tire unless otherwise noted.
- The normally inflated unloaded condition is such that the tire is mounted on a standard wheel rim and inflate to a standard pressure but loaded with no tire load.
- The undermentioned normally inflated loaded condition is such that the tire is mounted on the standard wheel rim and inflated to the standard pressure and loaded with the standard tire load.
- The standard wheel rim R is a wheel rim officially approved or recommended for the tire by standards organizations, i.e. JATMA (Japan and Asia), T&RA (North America), ETRTO (Europe), TRAA (Australia), STRO (Scandinavia), ALAPA (Latin America), ITTAC (India) and the like which are effective in the area where the tire is manufactured, sold or used. The standard pressure and the standard tire load are the maximum air pressure and the maximum tire load for the tire specified by the same organization in the Air-pressure/Maximum-load Table or similar list. For example, the standard wheel rim is the “standard rim” specified in JATMA, the “Measuring Rim” in ETRTO, the “Design Rim” in TRA or the like. The standard pressure is the “maximum air pressure” in JATMA, the “Inflation Pressure” in ETRTO, the maximum pressure given in the “Tire Load Limits at various Cold Inflation Pressures” table in TRA or the like. The standard load is the “maximum load capacity” in JATMA, the “Load Capacity” in ETRTO, the maximum value given in the above-mentioned table in TRA or the like.
- Incidentally, the tread edges are the axial outermost edges of the ground contacting patch which occurs under the normally inflated loaded condition when the camber angle of the tire is zero.
-
FIG. 1 is a cross sectional view of the pneumatic tire as an embodiment of the present invention. -
FIG. 2 is a perspective partial view of the tire showing the protector. -
FIG. 3 shows a patterned unit protrusion. - An embodiment of the present invention will now be described in detail in conjunction with accompanying drawings.
-
FIG. 1 shows a cross-section of apneumatic tire 1 as an embodiment of present invention under the normally inflated unloaded condition. As shown, thepneumatic tire 1 comprises atread portion 2, a pair of axially spacedbead portions 4 each with abead core 5 therein, a pair ofsidewall portions 3 extending between the tread edges and thebead portions 4, acarcass 6 extending between thebead portions 4 through thetread portion 2 and thesidewall portions 3, and atread reinforcing belt 7 disposed radially outside thecarcass 6 in thetread portion 2. Thetread portion 2 is suitably provided withgrooves 8 for draining water or mud. - The
carcass 6 is composed of at least one (in this embodiment, only one)ply 6A of cords extending between thebead portions 4 through thetread portion 2 and thesidewall portions 3, and turned up around thebead core 5 in each of thebead portions 4 from the axially inside to the outside f the tire so as to form a pair of turned upportions 6 b and amain portion 6 a therebetween. The carcass cords of theply 6A are arranged at an angle in a range from 75 to 90 degrees with respect to the tire equator c, for example. As for the carcass cords, organic fiber cords made of nylon, polyester, rayon, or the like can be suitably used. - The
belt 7 comprises at least two plies (in this embodiment, only twocross plies belt ply 7A intersect with those of thebelt ply 7B. As for the belt cords, high modulus cords, in particular steel cords are preferably used. - According to the present invention, at least one of the
sidewall portions 3 is provided with aprotector 9 protruding axially outwardly from theouter surface 3 a thereof. Theprotector 9 is made of rubber integrally with the sidewall portion. In this embodiment, each of thesidewall portions 3 is provided with theprotector 9. - The
protector 9 is preferably formed within a range between 0.5 times and 0.9 times the cross sectional height H of the tire from the bead base line BL.such protector 9 can improve the cut resistant performance of thesidewall portion 3. Here, the cross sectional height H of the tire is a radial distance from the bead base line BL to the ground contacting surface of the tread portion at the tire equator C. - More preferably, the radial height H1 of the radially
outer end 9 a of theprotector 9 from the bead base line BL is set in a range between 0.75 times and 0.85 times the cross sectional height H of the tire. If the radial height H1 is more than 0.85 times the cross sectional height H, the radiallyouter end 9 a of theprotector 9 becomes likely to come into contact with the ground when running on even roads such as well paved roads. Therefore, there is a possibility that the ride comfort is deteriorated and the wear of theprotector 9 occurs at an early stage. on the other hand, if the height H1 is less than 0.75 times the cross sectional height H, the region of the tire where cut damage is likely to occur cannot be protected, and it becomes difficult to improve the cut resistant performance. - Further, it is preferred that the radial height H2 of the radially
inner end 9 b of theprotector 9 from the bead base line BL is set in a range between 0.5 times and 0.6 times the cross sectional height H of the tire. If the radial height H2 is more than 0.6 times the cross sectional height H, the range protected by theprotector 9 becomes small, and the cut resistant performance can not be improved effectively. on the other hand, if the height H2 is less than 0.5 times the cross sectional height H, theprotector 9 becomes excessively large, therefore, it is possible that the tire weight increases and the heat becomes likely to accumulate. - The protruding height t of the
protector 9 is preferably not less than 2 mm, more preferably not less than 4 mm. If the protruding height t is less than 2 mm, the effect of theprotector 9 to protect thesidewall portion 3 is decreased, and the cut resistant performance is not improved. The protruding height t of theprotector 9 is preferably not more than 15 mm, more preferably not more than 12 mm. If the protruding height t is more than 15 mm, the tire weight increases and heat is likely to accumulate in theprotector 9. -
FIG. 2 is a perspective view of theprotector 9. As shown, theprotector 9 in this embodiment is composed of a number of patternedunit protrusions 9A arranged at intervals in the tire circumferential direction. In this embodiment, the patternedunit protrusions 9A on each of thesidewall portions 3 have the same shape and arranged in the same direction with respect respective radial directions of the tire. Preferably, the patternedunit protrusions 9A are disposed at substantially the same radial height. - As the patterned unit protrusions are arranged at intervals, the
protector 9 is provided with not-protruding parts between the patterned unit protrusions. Therefore, thesidewall portion 3 becomes less likely to accumulate heat, while maintaining the cut resistant performance. - Further, the concavity/convexity structure of the patterned
unit protrusions 9A and the not-protruding parts can disturb the air flow along the outer surface of the sidewall portion. As a result, it is possible to increase the heat dissipation. Accordingly, the temperature rise of thesidewall portion 3 is suppressed and the durability of thetire 1 is improved. - In this embodiment, the patterned
unit protrusion 9A is composed of a first protrudingportion 10, a second protrudingportion 11 and a third protrudingportion 12 as shown inFIG. 3 . - The first protruding
portion 10 and the second protrudingportion 11 extend in the tire radial direction, and are arranged so as to be spaced away from each other in the tire circumferential direction. - The first protruding
portion 10 is configured as substantially rectangular having a radial dimension L1 and a circumferential dimension w1. The radial dimension L1 is preferably greater than the circumferential dimension w1. - It is preferred that the circumferential dimension w1 is set in a range from 0.15 times to 0.3 times the circumferential dimension w of the patterned
unit protrusion 9A. If the circumferential dimension w1 is less than 0.15 times the circumferential dimension w, there is possibly that the effect of theprotector 9 to protect thesidewall portion 3 is decreased, and the cut resistant performance is not improved. on the other hand, if the circumferential dimension w1 is greater than 0.3 times the circumferential dimension w, there is a possibility that the tire weight is increased, and heat is accumulated in the patternedunit protrusion 9A. - The above-mentioned second protruding
portion 11 is configured as substantially rectangular having a radial dimension L2 and a circumferential dimension w2. The radial dimension L2 is preferably more than the circumferential dimension w2. - The circumferential dimension w2 is preferably set in a range from 0.15 times to 0.3 times the circumferential dimension w. If the circumferential dimension w2 is less than 0.15 times the circumferential dimension w, there is a possibility that the effect of the
protector 9 to protect thesidewall portion 3 decreases, and the cut resistant performance is not improved. on the other hand, if the circumferential dimension w2 is greater than 0.3 times the circumferential dimension w, there is a possibility that the tire weight increases, and heat is accumulated. - In this embodiment, the radial dimension L1 of the first protruding
portion 10 is more than the radial dimension L2 of the second protrudingportion 11. The patternedunit protrusion 9A having such first and second protrudingportions sidewall portion 3 can dissipate heat more efficiently, and the durability of thetire 1 can be further improved. - The first protruding
portion 10 has a pair of radial ends 10 e, namely, a radiallyouter end 10 a and a radiallyinner end 10 b, between which the radial dimension L1 is defined. The second protrudingportion 11 has a pair of radial ends 11 e, namely, a radiallyouter end 11 a and a radiallyinner end 11 b, between which the radial dimension L2 is defined. - It is preferred that the radial height of the radially
outer end 10 a of the first protrudingportion 10 is substantially the same as the radial height of the radiallyouter end 11 a of the second protrudingportion 11. In this case, the radiallyinner end 11 b of the second protrudingportion 11 is positioned radially outside the radiallyinner end 10 b of the first protrudingportion 10. Thereby, it is possible to have a wide range of non-convexed part radially inside the radiallyinner end 11 b of the second protrudingportion 11, therefore, it is possible to generate a greater swirling air flow during running. - It is preferred that the circumferential dimension w1 of the first protruding
portion 10 is substantially the same as the circumferential dimension w2 of the second protrudingportion 11. The patternedunit protrusion 9A having such first and the second protrudingportions tire 1. - It is preferred that a distance L3 between the first protruding
portion 10 and the second protrudingportion 11 in the tire circumferential direction is more than the circumferential dimension w1 of the first protrudingportion 10 and more than the circumferential dimension w2 of the second protrudingportion 11. By increasing the distance L3 as above, it is possible to further suppress the heat accumulation in thesidewall portion 3. - The above-mentioned third protruding
portion 12 connects between the first protrudingportion 10 and the second protrudingportion 11 in the tire circumferential direction. By the third protrudingportion 12, the patternedunit protrusion 9A can be increased in the rigidity in the tire circumferential direction. As a result, the third protrudingportions 12 suppress the movement of the tread edge, and improve the uneven wear resistance performance, therefore, it is possible to improve the durability of thetire 1. - It is preferred that the third protruding
portion 12 is connected with the first protrudingportion 10 at a position radially away from both of the radial ends 10 e (the radiallyouter end 10 a and the radiallyinner end 10 b). Thereby, the first protrudingportion 10 is likely to generate turbulence in the vicinity of the radial ends 10 e during running, therefore, it is possible to increase the heat dissipation from thesidewall portion 3. - It is preferred that the third protruding
portion 12 is connected with the second protrudingportion 11 at a position radially away from both of the radial ends 11 e (the radiallyouter end 11 a and the radiallyinner end 11 b). Thereby, the second protrudingportion 11 is likely to generate turbulence in the vicinity of the radial ends 11 e during running, therefore, it is possible to increase the heat dissipation from thesidewall portion 3. - Preferably, the third protruding
portion 12 is connected to a part of the first protrudingportion 10 closer to the radiallyinner end 10 b, and connected to a part of the second protrudingportion 11 closer to the radiallyinner end 11 b. In other words, the radial center of the connection part of the third protrudingportion 12 with the first protrudingportion 10 is positioned closer to the radiallyinner end 10 b than the radiallyouter end 10 a, and the radial center of the connection part of the third protrudingportion 12 with the second protrudingportion 11 is positioned closer to the radiallyinner end 11 b than the radiallyouter end 11 a. Therefore, when the radially outer parts of the first and second protrudingportions - The third protruding
portion 12 is preferably inclined with respect to the tire circumferential direction in order to increase the rigidity both in the tire circumferential direction and the tire radial direction. - It is preferred that the width w3 of the third protruding
portion 12 measured orthogonally to the longitudinal direction thereof is substantially the same as the circumferential dimension w1 of the first protrudingportion 10 and the circumferential dimension w2 of the second protrudingportion 11. Thereby, the patternedunit protrusion 9A consisting of the protrudingportions tire 1. - It is preferred that the total area of the first, second and third protruding
portions portion 10 and the circumferential dimension w of the patternedunit protrusion 9A. - If less than 40%, the effect to protect the
sidewall portion 3 is decreased, and it is possible that the cut resistant performance is not improved. on the other hand, if more than 60%, the tire weight increases, and it is possible that the heat is likely to accumulate therein. - while detailed description has been made of an especially preferable embodiment of the present invention, the present invention can be embodied in various forms without being limited to the illustrated embodiment.
- Test tires (pneumatic tires of size 265/70R17 for passenger cars) having the structure shown in
FIG. 1 and specifications listed in Table 1 were experimentally manufactured and tested for the cut resistant performance, heat dissipation performance and uneven wear resistance performance. The test methods are as follows. - The test tires were mounted on all of the wheels of a 4WD car, and after running for 1500 km on a rubble-strewn rough road, the sidewall portions were checked for cut damages. Then, for each of the cut damages, its length and width were multiplied to obtain the product, and the products were totalized. The results are indicated in Table 1 by an index based on the reciprocal number of Comparative example 1 being 100, wherein the larger the index value, the higher the cut resistant performance.
- Each test tire was set on a bench testing machine, and run for 24 hours at a speed of 100 km/h. Then, the temperature of the sidewall portion was measured. The results are indicated in Table 1 by an index based on the reciprocal number of Comparative example 1 being 100, wherein the larger the numeric value, the lesser the heat accumulation (or the higher the heat dissipation performance).
- Each test tire was set on the bench testing machine, and run for 24 hours at a speed of 100 km/h. Then, the variation of wear of the tread portion was measured. The results are indicated in Table 1 by an index based on the reciprocal number of comparative example 1 being 100, wherein the larger the numeric value, the higher the uneven wear resistance performance.
-
TABLE 1 Comp. Comp. Comp. Working Working Working Working Working Working Working Tire example 1 example 2 example 3 example 1 example 2 example 3 example 4 example 5 example 6 example 7 Third protruding portion absence absence presence presence presence presence presence presence presence presence Ratio L2/L1 of first and 1 0.5 1 0.5 0.3 0.7 0.5 0.5 0.5 0.5 second protruding portions Ratio W2/W1 of first and 1 1 1 1 1 1 0.7 1.5 1 1 second protruding portions Connection position of third NA NA Other than other than other than other than other than other than end other than protruding portion with first end end end end end end end and second protruding portions Inclination of third protruding NA NA parallel inclined inclined inclined inclined inclined inclined parallel portion with respect to tire circumferential direction Cut resistant performance 100 95 110 105 100 110 100 110 105 105 Heat dissipation 100 110 90 120 125 110 120 110 110 110 Performance Uneven wear resistant 100 95 105 120 110 115 110 110 110 115 Performance - From the test results, it was confirmed that the test tires as the working examples were improved in the heat dissipation performance and the uneven wear resistant performance, while maintaining about the same cut resistant performance as the comparative examples.
- 1 pneumatic tire
- 3 sidewall portion
- 3 a outer surface of sidewall portion
- 9 protector
- 9A patterned unit protrusion
- 10 first protruding portion
- 11 second protruding portion
- 12 third protruding portion
Claims (20)
Applications Claiming Priority (2)
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JP2016009929A JP6699192B2 (en) | 2016-01-21 | 2016-01-21 | Pneumatic tire |
JP2016-009929 | 2016-01-21 |
Publications (2)
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US20170210182A1 true US20170210182A1 (en) | 2017-07-27 |
US10427473B2 US10427473B2 (en) | 2019-10-01 |
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US15/409,668 Active 2037-11-26 US10427473B2 (en) | 2016-01-21 | 2017-01-19 | Pneumatic tire |
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US (1) | US10427473B2 (en) |
EP (1) | EP3196054B1 (en) |
JP (1) | JP6699192B2 (en) |
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US20170259624A1 (en) * | 2016-03-14 | 2017-09-14 | Sumitomo Rubber Industries, Ltd. | Pneumatic tire |
US20190054776A1 (en) * | 2017-08-17 | 2019-02-21 | Toyo Tire & Rubber Co., Ltd. | Pneumatic tire |
US10358002B2 (en) * | 2016-01-07 | 2019-07-23 | Sumitomo Rubber Industries, Ltd. | Pneumatic tire |
US20210188019A1 (en) * | 2019-12-19 | 2021-06-24 | Sumitomo Rubber Industries, Ltd. | Pneumatic tire |
US20210197627A1 (en) * | 2019-12-25 | 2021-07-01 | Sumitomo Rubber Industries, Ltd. | Pneumatic tire |
US11633992B2 (en) | 2020-07-17 | 2023-04-25 | Toyo Tire Corporation | Tire |
US11667160B2 (en) | 2018-08-21 | 2023-06-06 | Sumitomo Rubber Industries, Ltd. | Pneumatic tire |
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JP6913574B2 (en) * | 2017-09-08 | 2021-08-04 | Toyo Tire株式会社 | Pneumatic tires |
JP7095244B2 (en) * | 2017-09-21 | 2022-07-05 | 住友ゴム工業株式会社 | Pneumatic tires |
JP6890086B2 (en) * | 2017-12-12 | 2021-06-18 | 株式会社ブリヂストン | Heavy load tires |
JP7119634B2 (en) * | 2018-06-21 | 2022-08-17 | 住友ゴム工業株式会社 | pneumatic tire |
JP7115074B2 (en) * | 2018-07-02 | 2022-08-09 | 横浜ゴム株式会社 | pneumatic tire |
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2017
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Cited By (9)
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US10358002B2 (en) * | 2016-01-07 | 2019-07-23 | Sumitomo Rubber Industries, Ltd. | Pneumatic tire |
US20170259624A1 (en) * | 2016-03-14 | 2017-09-14 | Sumitomo Rubber Industries, Ltd. | Pneumatic tire |
US20190054776A1 (en) * | 2017-08-17 | 2019-02-21 | Toyo Tire & Rubber Co., Ltd. | Pneumatic tire |
US10974551B2 (en) * | 2017-08-17 | 2021-04-13 | Toyo Tire Corporation | Pneumatic tire |
US11667160B2 (en) | 2018-08-21 | 2023-06-06 | Sumitomo Rubber Industries, Ltd. | Pneumatic tire |
US20210188019A1 (en) * | 2019-12-19 | 2021-06-24 | Sumitomo Rubber Industries, Ltd. | Pneumatic tire |
US20210197627A1 (en) * | 2019-12-25 | 2021-07-01 | Sumitomo Rubber Industries, Ltd. | Pneumatic tire |
US11897292B2 (en) * | 2019-12-25 | 2024-02-13 | Sumitomo Rubber Industries, Ltd. | Pneumatic tire |
US11633992B2 (en) | 2020-07-17 | 2023-04-25 | Toyo Tire Corporation | Tire |
Also Published As
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EP3196054B1 (en) | 2019-12-04 |
CN107020895A (en) | 2017-08-08 |
CN107020895B (en) | 2020-10-27 |
EP3196054A1 (en) | 2017-07-26 |
US10427473B2 (en) | 2019-10-01 |
JP2017128267A (en) | 2017-07-27 |
JP6699192B2 (en) | 2020-05-27 |
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